exam Maths Puzzle Numerical Ability

10: Points (?, 3) and (-2, -5) lie on a line with slope 4. What is the missing coordinate?

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Please help.

Solve the following system by graphing.

2x - y = 4
2x - y = 6

Thanks
JMS Solve for x by completing the square:

kx^2-3cx-4a=0

I have tried but I wonder if there is no solution. Thanks for your time!
By the way, this question is not from any textbook. My teacher had it on the board for the class to solve.